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Washington University Experience | NEOPLASMS (GLIAL) | Oligodendroglioma - IDH1 mutant, del 1p19q - Grade 2 | 7C Oligodendroglioma & histiocytes, WHO II (Case 7) CD68 3.jpg
7C The abundant perivascular histiocytic cells are highlighted with a CD68 stain. Histochemical staining for iron is negative in the histiocytic cells. ---- Not shown: The tumor is positive for Isocitrate Dehydrogenase 1 (IDH1) mutant R132H. The proliferation marker Ki67 stains a subset of tumor cell nuclei at variable density, ranging focally from 4.2% to 8.5%. ---- FISH studies show deletion of 1p/19q..
